EMP Bomb
From TaRapedia
EMP Bombs can be detonated to deal massive amounts of EMP damage, and can crit for even higher damage. They are single-use and can be purchased from most standard vendors. All EMP Bombs have a range of 15 meters, regardless of level.
[edit] Usage
To use an EMP Bomb, simply place it in the area you would like to detonate it in and it will explode after a delay of a few seconds. The detonation will not damage you or your group. You can only have one bomb placed at a time - if you place another before the first has detonated, your first one will simply vanish.
EMP Bombs are best used against mechanical or electrical targets that have high HP and regeneration. Cannons, force fields and mechanical bosses like Rotting Sal are excellent targets for EMP Bombs.

